The arithmetic mean of attendance of 49 students of class A is 40% and that of…
2011
The arithmetic mean of attendance of 49 students of class A is 40% and that of 53 students of class B is 35%. Then the percentage of arithmetic mean of attendance of class A and B is
- A.
27.2%
- B.
50.25%
- C.
51.13%
- D.
37.4%
Attempted by 122 students.
Show answer & explanation
Correct answer: D
To find the combined arithmetic mean, first calculate the total attendance points for each class. For Class A: 49 students × 40% = 1960 points. For Class B: 53 students × 35% = 1855 points. Add these together: 1960 + 1855 = 3815 total points. Next, find the total number of students: 49 + 53 = 102 students. Finally, divide the total points by the total number of students: 3815 ÷ 102 ≈ 37.4%. Thus, the combined arithmetic mean of attendance is approximately 37.4%.